scholarly journals An Apparent Red-backed Junco, Junco hyemalis dorsalis, in California

Western Birds ◽  
2021 ◽  
Vol 52 (3) ◽  
pp. 271-275
Author(s):  
Kimball L. Garrett
Keyword(s):  
2004 ◽  
Vol 13 (3) ◽  
pp. 671-681 ◽  
Author(s):  
C. A. Rasner ◽  
P. Yeh ◽  
L. S. Eggert ◽  
K. E. Hunt ◽  
D. S. Woodruff ◽  
...  

2011 ◽  
Vol 22 (6) ◽  
pp. 1256-1263 ◽  
Author(s):  
Danielle J. Whittaker ◽  
Kaitlin M. Richmond ◽  
Allison K. Miller ◽  
Ryan Kiley ◽  
Christine Bergeon Burns ◽  
...  

2002 ◽  
Author(s):  
V. Nolan ◽  
E. D. Ketterson ◽  
D. A. Cristol ◽  
C. M. Rogers ◽  
E. D. Clotfelter ◽  
...  
Keyword(s):  

2006 ◽  
Vol 33 (1) ◽  
pp. 183-198 ◽  
Author(s):  
Helena A. Soini ◽  
Sara E. Schrock ◽  
Kevin E. Bruce ◽  
Donald Wiesler ◽  
Ellen D. Ketterson ◽  
...  

Behaviour ◽  
2013 ◽  
Vol 150 (9-10) ◽  
pp. 1183-1202 ◽  
Author(s):  
Rebecca J. Rice ◽  
Dustin G. Reichard ◽  
Sara E. Schrock ◽  
Elizabeth M. Schultz
Keyword(s):  

2019 ◽  
Vol 66 (3) ◽  
pp. 239-245 ◽  
Author(s):  
Madelin Andrade ◽  
Daniel T Blumstein

Abstract Flight-initiation distance (FID), the distance between an individual and experimenter when it begins to flee, can be used to quantify risk-assessment. Among other factors, prior studies have shown that latitude explains significant variation in avian FID: at lower latitudes, individuals and species have longer FIDs than those living at higher latitudes. No prior studies have focused on the effect of elevation on FID. Given the similar patterns of seasonality, climate, and potentially predator density, that covary between latitude and elevation, birds at higher elevations might tolerate closer approaches. We asked whether elevation or latitude would explain more variation in the FID of a common passerine bird species, dark-eyed juncos (Junco hyemalis). Juncos live in a variety of habitats along both latitudinal and elevational gradients. We found that statistical models containing elevation as a variable explained more of the variation in FID than did models containing latitude. We also found, unexpectedly, that birds at higher elevation fled at greater distances. While more predators were sighted per hour at higher elevations than at lower elevations, the frequency of predator sightings did not explain a significant amount of variation in FID. This result questions whether predator density is the main driver of risk perception along elevational gradients. Nonetheless, because elevation explains more variation in FID than latitude in at least one species, these findings have direct implications on how human impacts on birds are managed. Specifically, those designing set-back zones to reduce human impact on birds may consider modifying them based on both latitude and elevation.


The Auk ◽  
1987 ◽  
Vol 104 (2) ◽  
pp. 303-310 ◽  
Author(s):  
Ellen D. Ketterson ◽  
Val Nolan

Abstract In previous experiments, Dark-eyed Juncos (Junco hyemalis) were captured on a winter home range to which they had shown year-to-year site fidelity and held there until just before the autumn. They failed to show normal autumn migratory restlessness and fattening, which suggested that previous experience at the migratory destination suppressed readiness to migrate. We asked what the suppressing cues might be. Possibilities included very local features peculiar to the individual's winter home range (e.g. its trees) and cues common to the general region (e.g. geophysical or celestial information); features of the latter sort might give information about latitude. To test these possibilities we monitored autumn restlessness and fattening of new groups of juncos that were held before migration where some could perceive landmarks of their familiar winter home range and others only more general information about their location. In autumn those held at, near, and far south of their winter home ranges again failed to become restless or fat. A small group held far north of their winter home ranges became somewhat restless, significantly more so than the others. These may have perceived that they had not reached their usual winter latitude, but alternative explanations are possible.


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